CARBON EXPRESS GRAIN SCALE One of the keys to accuracy is consistency in weight across your arrows. The closer your arrows and components are in weight the more consistent they’ll be. Perfect for weighting arrow, points, nocks, inserts, fletching or full shafts. Compact, lightweight and easy to use this unit is accurate to within .15 of a grain and measures in grains, ounces, grams, & more all displayed on a bright and easy to read LCD screen.